A strain is said to be "WHITE" because White Marijuana seeds varieties produce a magnificent amount of white THC crystals/pistils in the flowering stage. When the marijuana plants are ready for harvesting the buds/flowers are covered with loads of white crystallized sticky resin. Some marijuana crops have so much sparkly and shimmering THC crystals and dense hairs, that it is hard to see the green of the marijuana buds/leaves at all. Even after drying the marijuana buds/flowers are covered with a white glow.